TriangleTube SMART Series, Installation & Maintenance Manual

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24
CHAPTER
5
CHAPTER 5 - WATER HEATER MAINTENANCE
Water from opened drain valves, unions and
other connections may be extremely hot. To
avoid substantial property damage, serious
injury, or death:
- Tighten all drain hose connections.
- Direct hot water away from all persons.
5.3.1 Draining Inner (Domestic Water) Tank.
There are 3 methods typically used in the drain-
ing of the inner tank. The first method outlined
as Option 1 is to siphon the water out. This
method is typically the easiest to perform, but
may be lengthly in time to complete.
The second method, shown as Option 2, uses com-
pressed air. This method is more complicated how-
ever it is generally quicker in draining the tank.
The final method, Option 3, use a pump to drain the
tank. As with Option 2, Option 3 is generally more
complicated, but is quicker in draining the tank.
Prior to draining the inner tank, ensure the fol-
lowing is completed:
• The snap-set wiring connection at the wa-
ter heater is disconnected.
• The DHW system supply isolation valve is
closed.
• The outer (boiler water) tank pressure is less
than 15 psig
Reference domestic piping diagram, see Fig. 2
on page 7 thru Fig. 4 on page 8.
Draining Inner Tank - Option 1
1. Connect a hose to the domestic water drain valve
at the cold water inlet. The hose should extend to a
drain at floor level to allow siphoning of the domes-
tic inner tank.
2. Open a hot water faucet at the highest point above
the water heater.
3. Open the domestic water drain valve to start the
siphoning of the domestic inner tank.
WARNING
NOTICE
4. When draining is complete, close the hot water fau-
cet and the domestic drain valve.
Draining Inner Tank - Option 2
1. Connect a hose to the domestic water drain valve
at the cold water inlet. Direct the hose to a proper
drain/suitable place for drainage.
2. Close the isolation valve on the DHW system hot
outlet of the water heater.
3. On the hot water outlet piping between the water
heater and the isolation valve install a shrader (air
tank) valve or some other fitting or means that al-
lows connection of an air hose from a compressor.
4. Open the domestic water drain valve on the cold
water inlet.
5. Apply compressed air at a maximum regulated
pressure of 40 psig.
6. When draining is complete, remove the air hose
and fittings needed to connect the air hose.
7. Close the domestic water drain valve on the cold
water inlet and open the isolation valve on the hot
water outlet.
Draining Inner Tank - Option 3
1. Connect the suction side of the pump to the domestic
water drain valve using a hose and/or piping fittings.
2. Connect a hose to the discharge side of the pump.
Direct the hose to a proper drain or a suitable place
for drainage.
3. Open a hot water faucet at the highest point above
the water heater.
4. Open the domestic water drain valve and start the
pump to begin draining the inner tank.
5. When draining is complete stop the pump, close
the hot water faucet and close the domestic drain
valve. Remove the pump and all hoses and fittings.
5.3.2 Draining Outer (Boiler Water) Tank
1. Disconnect snap set wiring connection at water
heater.
2. Close boiler water isolation valves between boiler
and water heater.
3. Connect hose to boiler water drain valve at water
heater. Open and drain water to a safe place.
4. To speed draining procedure, open manual air vent
on top of tank.
5. When draining is complete, close drain valve and
close manual air vent.
BEST PRACTICE